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柴达木盆地北缘冷湖地区的侏罗系—古近系储层是柴北缘地区的重点勘探对象,通过对采自该区7口典型钻井中的储层岩心样品进行流体包裹体分析,揭示了油气运移的一些基本特征。首先,根据储层含油气包裹体丰度的差异,认为冷湖地区并不存在从五号→四号→三号构造的顺层油气运移指向,油气主要自昆特依凹陷呈放射状向构造带运移。其次,储层油气包裹体类型的差异表明,深部侏罗系储层中曾经接受过一期成熟度较低的石油充注,但规模可能有限;冷湖地区可能并不存在大规模的天然气聚集;原油普遍遭受过水洗降解等次生变化。最后,综合包裹体岩相学和显微测温结果,提出本区侏罗系—古近系储层中目前所发现的油气大多为中新世后形成。这些认识为区域油气深入勘探提供了重要的基础参考信息。
The Jurassic-Paleogene reservoir in the Lenghu area on the northern margin of the Qaidam basin is a key exploration target in the northern Qaidam Basin. Through fluid inclusion analysis of reservoir core samples collected from seven typical wells in the area, Revealed some of the basic characteristics of hydrocarbon migration. First of all, according to the abundance differences of oil-gas inclusions in reservoirs, it is considered that there is no point of hydrocarbon migration in the Lenghu area from the sequence of oil and gas migration from No.5 → No.4 → No.3, and the oil and gas mainly radiate from the Quaternary depression With the transport. Second, differences in reservoir types of oil-gas inclusions suggest that a lower maturity oil charge was accepted in the deep Jurassic reservoirs, but the scale may be limited; large-scale accumulation of natural gas may not exist in the cold lakes Crude oil generally suffered secondary changes such as degradation by washing. Finally, based on the petrographic and microscopic temperature measurements of the inclusions, it is proposed that most of the hydrocarbons discovered in the Jurassic-Paleogene reservoirs of this area were mostly formed after the Miocene. These understandings provide important basic reference information for regional oil and gas exploration.